Subaru generators feature the latest in inverter generator technology which reduces running sound. Conventional generators run the engine at full speed regardless of the amount of power being used, while inverter generators run the engine at a slower speed for low power use and automatically increase speed as more electrical power is required. Further sound reduction is achieved through the reverse cooling design. This allows the generators to be enclosed in a sound-absorbing poly-resin enclosure. Models are available in 1,650-, 3,200- and 4,300-watt capacities.